Notching machine



Sept. 20, 1949. e. H. NORQUIST NOTCHING MACHINE Filed June 23, 1945 4 Sheets-Sheet 1 NNN Q mvem TOR file/m if Wbrymls/ TbY mwmbav x awew ATTORNEYS p 20, 1949. G. H. NORQUIST 2,482,122

NOI'CHING MACHINE Filed June 23, 1945 4 Sheets-Sheet 2 [INVENTORY fill uh b. fiwyazisf BY m, Maw Q W IITTORNEYS G. H. NORQUIST NOTCHING MACHINE Sept. 20, 1949.

Filed June 23, 1945 4 Sheets-Sheet 3 2 H m N m 2 m m 61A. fl 1. w 5 0 w a x I l/lln M w m 7 w m m ATTORNEYS Sept. 20; 1949. e. H. NORQUIST 2,

7 NOTCHING MACHINE Filed June 23, 1945 r Y 4 Sheets-Sheet 4 a .66 t 1/2 zz '20 MM 6 W RTTORNEYJ'.

Patented Sept. 20, 1949 UNITED STATES PATENT OFFICE NOTCHING MACHINE Glenn H. Norquist, Jamestown, N. Y.

Application June 23, 1945, Serial No. 601,211

This invention relates to notching machines, and more particularly to an improved machine for cutting and forming irregular shaped holes or notches in wood, plywood fibreboard, composition board and like materials.

The machine forming the subject matter of this invention is particularly adapted for cutting holes or notches in Wood, plywood, fibreboard, composition board and like materials which holes and notches have such irregular shape and conformity that the same cannot be made by an ordinary drilling or punching tool. For example, in certain fabrication operations it is necessary to provide preformed notches of accurate shape and form in the corners of plywood and composition board panels so as to permit the formation of flange or side sections, the ends of which will meet to form a neat corner or joint. The formation ofsuch notches require the removal of a V-shaped section of the material of accurate size and shape With the contracted or pointed end of the notch cleanly cut and with the side faces of the notch inclined or beveled at an accurate predetermined angle.

The machine constructed inaccordance. with so as to form clean cut and smooth inclined or beveled surfaces which define the side faces of the notch. An end cutting knife, sliding in a guide member, is provided with a cutting end or point which is driven into the material and smoothly cuts and shapes the contracted orpointed end of the notch. The workpiece or panel rests upon the surface of a bedplate-provided with guide bars to retain the Work piece or panel in the proper operating position during the notching operation. Pressure blocks, adapted to reciprocate in grooves provided in the paired guide blocks, are provided to press the work piece or panel firmly against the bedplate during the cutting operation. Resilient elements, such as coilsprings, are providedto press the-pressure blocks against the work piece during the notching operation with a predetermined pressure, means being provided to lift the pressure blocks away from the work piece topermit insertion of the Work pieceto be'operated upon under the pres 17 Claims. (01. 164-50) sure blocks and to permit removal of the notched work piece from the machine.

The side cutting knives,,the end cutting knife, and the pressure blocks are operatively connected to a pressure plate which may be conveniently attached to the reciprocable slide frame of a mechanical press. The end cutting knife maybe clamped or otherwise secured in a fixed manner to the pressure plate while the side cutting knives are connected to the-pressure plate by an adjustable linkage mechanism which permits the side cutting knives to reciprocate at the desired beveled cutting angle. The pressure plate is provided with a pair of cam elements each having a cam face adapted to ride over and press against a head block. attached to the upper end of each of the side cutting knives to drive the cutting ends of the cutting knives-into the work piece material. The linkage mechanism ispivotally connected to the: knife heads: and to the pressure plate in a manner so that the cutting ends of the knives and the pressure faces of the pressure blocks may be raised from the work piece material when the pressure plate is raised a predetermined distance; The linkage mechanism is provided with adjusting means to permit a predetermined amount of play between the pressure plate and the knife heads; The pressure blocks are connected to the lmife heads in such a manner as to causethe pressure blocks to move into contact with the: work piece an instant be fore the cutting knives are driven into the material,.with the-pressure'blocks remaining in pres- Sure contact with the work piece during withdrawal of theside cutting'knives.

The various operating parts of the notching machine are constructed. and: formed to operate in synchronism with the reciprocation of the pressure plate. The reciprocation of the pressure plateis under the constant control of the operator through a control device associated with the mechanical press; whose reciprocable pressure frame is connect'ed to the pressure plate. This machine permits the operator to cut and form the required notch in the work piece in a single operation which requires less than a sec- 0nd to perform. When a convenient feed table means is provided to feed andwithdraw the successive work pieces to andfrom the machine, a single operator can cut 500 or more notches per hour.

An object of this invention is to provide an improved machine for cutting irregular shaped holes and. notches in workpieces with precision and accuracy and with the minimum of labor and at low cost.

Another object of this invention is to provide an improved automatic cutting machine adapted to operate upon wood, plywood, fibreboard and composition panels and remove V-shape sections from the panel of accurate predetermined form and shape.

A further object of this invention is to provide an improved machine for cutting irregular holes and notches in work piece materials, which is strong and sturdy in construction, simple and fool-proof in operation, and which is adapted to" perform a variety of cutting and notching operations accurately and at relatively high production speeds.

erated upon by the machine to remove a V-shaped notch 41. of, the desired size andcontour so as to permit subseduent shaping and forming of the panel. It will be noted by referring to Fig. 4

that the side faces b are cut on a bias and that Other objects and advantages of this invention will become apparent as the disclosure proceeds.

Although the characteristic features of this invention will be particularly pointed out in the claims appended hereto, the invention itself, and the manner in which it may be carried out, may be better understood byirefe'rring to the 'following descriptiontaken in connection with the ac companying drawings forming a part hereof, in which J I Fig. 1 is a front elevational view of the im' proved panel notching machine shown in association with a power dri ven press for operating the same, and a feed table for supporting the work piece operated upon.

Fig. 2 is a side elevational view of the machine and associated press and feed table, certain parts being broken away to reveal certain operating details. g

Fig. 3 is a perspective front face view of the notching machine as it appears when'removed from the operating press. 7 4 I Fig; 4 is' a fragmentary perspective view'of a 7 corner portion of a panel showing a notch cut in the corner of the panel by the chine.

Fig. 5 is a'fragmentary perspective view of a corner portion of the panel shown in Fig. 4 after being clad with a metal sheet and grooved so as to permit shapingof the panel flanges, this view showing the manner in-which the adjacent ends of the grooves'intersect and match with the notching ma:-

notched out corner'of the panel. i

Fig. 6 is an elevational rear face view of the notching machine as the same appears when viewed in the direction of the arrows 6-6 of Fig, 7, certain parts being broken away to illustrate structural details. r Fig, 7 is a top view of the machine'shown partly in section to illustrate structural details thereof, this view being taken along line 1-1 of Fig. 6.

Fig. 8 is a vertical cross sectionalwiew of the notching machine as the same appears when 1 viewed along line 8'8 of Fig. 6. Fig. 9 is a fragmentary cross sectionalaview of the machine as the same appears when viewed along line 99 of Fig. 6; and r Fig. 10 is a top plan view of a corner portion of the panel in position for notching out a corner thereof, this view also showing the cutting ends of the side cutting knives and the endcutting knife in position to puncture and cut the panel, as the same appears when looking in the direction of the arrows Ill-l0 of Fig. 8.

. Similar reference characters refer to similar parts throughout the several views of the drawings and specification.

Referring more particularly to Figs. 1 and 2,

the inner end of the notch a presents a narrow straight face 0 which is substantially perpendicularto the surface of the panel p. The shape or angularity of the V-shaped cut-out a may be formed as desired to permit final shaping of the panel inthe desired form by subsequent forming operations.

Fig. 5 illustrates the panel 11 shown in Fig. 4' after a metal facing sheet 112 has been bonded and secured to the lower face thereof. The panel to shown in Fig. 5 has also been provided with grooves g of generally V-shaped crosssection which divides the panel into a main section it and flange sections 1. It will be noted that the grooves g intersect the inner end of the notch cut-out a soas to obliterate the narrow perpendicular facing wall 0 which defines the inner end of the notch as shown in Fig. 4. In a subsequent operation the exposed corner portion m of the metal facing sheet m is suitably crimped so as to permit double ply folding thereof. By further operations, the metal-clad grooved and notched panel as illustrated in Fig. 5 is placed in a forming pressand the flange sections 7 thereof are bent to a predetermined angle with respect to the center section, which operation substantially closes the grooves g. In this forming operation the metal corner portion m. folds inwardly so as to provide a double ply rib'withfthe side faces'b of the notch cutout a clamping the metal ribiformation therebetween. g

It will be appreciated that the shape and contour of the notch cut-out a is determined by the angle to which the flange sections f of the ultimate metal clad panel is to be bent or shaped with respect to the main section d thereof. For example, if the flange sections f are to ultimately extend at an angle of approximately 45 to the main section d of the metal clad panel, the faces 17 of the notch a should present therebetween an angle of approximately 45, and if the flange sections 1 are to extend at an angle of approximately to the main section 11 of the metal clad panel, the faces b of the notch cut-out a should present therebetween an angle of approximately 90?. It will also be appreciated that the side faces I) of the notch cut-out should be so biased or inclined that these faces extend substantially parallel to one another when the flanges of themetal clad panel have been finally formed, and yet the side faces b when thus paralleled should be spaced apart asufiicient distance to permit the formed inturned metalrib to wedge snugly therebetween.

'This invention is more particularly directed depth and angularity, so that the end face 0 of the V notch cut-out is precisely defined and properly shaped, and so that the segment to be removed is completely severed. The ndtching machine A for per-forming operation is shown fully assembled in Fig. 3 and comprises generally a nod plate in which supports two's-imila-r spaced front guide blocks H and two similar spaced rear guide blocks flit. Each of the front guide blocks 1-1 is paired with one of the rear gt ude blocks I 2 and "are secured to a filler block 13 positioned therehetween by means of tie bolts M. The lower ends of the filler blocks 13 may be welded or otherwise permanen tl secured to the bed plate 35. It wtll be noted that one pair of front and rear guide blocks I and 42 are positioned on the left hand side of the center line of the machine, designated as line r-rin Fig. '7, and the other pair of trout and rear guide :blocks are positioned on the right hand side of the center line at-w.

As shown more particularly in Figs. 6 .and 1, '1

similar right and left-hand side cutting knives "20 are provided. Each knife is relatively ilat and straight and the sid edges thereof are guided to slide 'in relatively snug inclined grooves formed in the adjacent paired front and rear guide blocks H and [2. It will .be noted that the downwardly inclined guide grooves 15 "in the front and rear guide blocks are so formed and rearranged as to retain the mute at an angle to the horizontal axis of the machine indicated by "the center line x--:c in Fig. 7 As shown in .6, the lowerend of each side "knite is proyide'd with fa. sharp cutting edge 21 shaped and :formed to accurately out and form the side races 1) of the notch a. A head block '3!! is mounted onthe upper end of each side knife so as to reciprocate therewith. The head :b'look 3'0 :is connected to its knife .20 by means of 'a slot .3I .into which the upper end of the knife is snugly seated and there removably held in position by means of a set screw 32 the end 'of which seats inzan appropriate groove 23 provided in he kni fe flela'de, :as more particularly shown in Fig. 6. .Each head block 3!] slides in inclined guide grooves it "formed in the paired front and rear guide blocks H and 1-2, as shown more particularly in Figs}; and 7.

A right and a left hand pressure block 4!! is provided to seat firmly on the panel operated upon at a point immediately adjacent tothe outting edges 21 of the side knives "20. Each pres- Jstli'e block M! is arranged to slide in guide grooves 46 formed in each pair "of front and rear guide blocks M and 12. Each pressure block 41] is operatively connected to the knife head block 80 by a sturdy metal spindle '41, the upper end of which is provided with a threaded portion '42 which is screwed into the lower end or the head block (as shown in Fig. 6. The lower end of the spindle 4| is provided with a zplun'ger head '43 adapted to snugly reciprocate in a plunger-- head cavity '44 formed within the pressure lolock A l. A coil spring '45 surrounds each spindle '41,

with the upper end of the spring abutting against the lower face $3 of the head block 30 and with the lower end of the compression spring seating on the upper end 46 of th pressure block M3. will be appreciated that the *coil spring normally resiliently retains the head block 80 and the associated pressure block separated to the maximum extent, with the :head end 43 of 1 the spindle 4| seating against the upper end wall of the cavity '44 in the pressure block 4! When downward pressure is exerted on the head 3 0, the coils-spring 45 exerts downward "be kept suitably lubricated to insure smooth and emc'ien't operation.

The end face 1: of the notch a is cut by :a vertically extending end knife 21 having a cutting end 21 the appropriate shape as shown in Figs. '6 and '7. The end cutting knife -2| is guided in .its vertical reciprocatin movement by means of an end guide block #25 having .a slot 26 therein through which the end knife 21 reciprocates. The end guide block 25 may be conveniently tabricated lirorn two sections 25' which interiit together to form a guide slot '26 therebetween. The sections 25 may he firxnly secured together by means of tie screws 29. The guide block 25 is positioned between the left and righteh'and front guide blocks H and is Secured thereto by means of a retaining plate 28, as shown more particularly in Figs. 3 and 9., the retaining plate 2-8 being secured as :by bolts 28 'to the adjacent left and right-hand front guide blocks H and to the end guide block 25 by means of suitable screws 28".

.The panel p to be notch-ed "is placed to lie flat upon the face of a bed plate Ill so that the comer of the panel may be notched as shown in Fig. 4. Guide bars 4! are adiustahly secured to the base plate ID as by screws 4-8 to guide the side edges or the panel so that the comer thereof will properly be positioned beneath the.

cutting edges ll of the side cutting knives .20 and the'euttingsedge 2 1- of the end cutting knife 21. The lower center section of the left and right-hand front guide blocks H are formed to provide a cavity I9 into which the corner section of the :panel may be inserted. The lower center section of the left and right-hand rear .guide blocks l2 :arealso cut away as at 19 to permit insertion of the corner section of the panel to be operated upon.

The side cutting knives 2'0 and the end cutting knife 21 are reciprocated into and out of cutting position by means of a reciprocally eperated pressure plate 58 to which the knives are operatively connected. An attaching lug 25 secured to the pressure plate 50 as by screws 52 projects downwardly therefrom and is provided with a vertical extending groove 53 into which the upper end of the end cuttin knife may snugly seat, as shown more particularly in :Figs. 3, 6 and -8. Since the end cutting knife 2'! is substantially straight, the groove 53 in the supporting lug 5! should be substantially in alignment with the knife guide slot 26 in the end guide block 2-5. The end cut-ting knife 2-1 .is clamped or secured to the downward extending lug 5:! by means of a clamp plate 54 secured to the lug 51 by means of screws 55. Upon loosening of the securing screws '55; the end cutting knit-e 2H may :be upwardly withdrawn :from the -m achine through an "appropriate slot 56 provided in the pressure plate 50. .Ilhusit will Tbeappre- =ciated that when the pressure plate 50 is avertiknives. 'lug 51, is integrally formed with the pressureplate from the pressure plate 50;

cally'reciprocated, the end cutting knife ZTI attachedthereto and extendin downwardly there- .from will be reciprocated into and out of cutt ng position. Since: the. side cutting knives 20- must operate 'ona downwardly inclinedangle, means are provided inassociation with the pressure plate 50 to permit such-movement of the side cutting To this'end a left and right hand cam 50 and extends; downwardly therefrom; Each "of the cam lugs 51 is provided with an inclined cam facel58 designed to'engage and slide over the adjacent head block 30 attached to the side cutting knife 20. As shown more particularlyin .3Fig. 6,1each of the head blocks 30 is; provided with a bearing plate 34 having a cam face 135 overwhich the cam face 53 of :the cam lug v'! may slide in asmooth operating manner. The

slightly greater than 90 :with respect to 1 each other. An elongatedslot 63 is cutlen'gthwise'in the arm 62 through which a sturdy pin' 64 extends. The pin 64 is provided with a'suitable head 65 to prevent removal ofthe yoke 60 therefrom. The pin 64 is attached to a suitable securing lug 66 afiixed to'a'n'd extendingdownwardly The lower'end of the arm 6| isattached to a headed h'ingepin fi'lsecured to a hinge block 35 fixed to and forr'ning a part of the knife head block 30. 'Thus it will be noted that the pressure plate 50' is I hingedly connected to the by they'okes 60.

knife head blocks 35 When downward pressure is exerted on the pressure plate 50, the yokes fifl'will pivot about the headed hinge pins 61 and each pin"64at-' tached to the pressure plate 50 will slide in its slot'63 toward the knee portion 63 of the yoke 50. When the downwardly moving'carnfaces 58 ofthe cam lugs 51 having been brought into riding contact with thebearingblocks "34 associatedwith the knife headbloc'ks 30, furtherdownward movement of the pressureplate 50 drives the cutting ends 2| of the'knives 20 into cutting engagement with the panel operated upon. 7

On the upstroke of the pressure plate 50, the pins 64 carried by the pressure plate 50, will slide in their respective slots 63towards the outer ends of the-yoke arms 62. Stop'me'ans are provided to limit "the sliding movement of the pins 64 in the slotted arms 62, which stop means may com-' prise a threaded stop pin!!! extendingthrough the threaded head portion II at the end of yoke arm 62. The threaded pin 10 may be provided with a stop nut 12 to retain the threaded stop pin 19' in predetermined position. The end 13 -'of the threaded stop pin 10 serves to limit the rs'liding movement of pin 64 in the yoke slot "63.

When the pin 64-abuts the stop end I3 of the :threadedstop-pin- 10 the yoke arm 6I' will serve as a lifting link to lift'the knife'head block 30 I anditsassociated -blade upwardly to a point where the lower'cutting edge -21 of the cutting knife :20 has-been raised above the panel operated upon. It willbe noted that the yokes 50 permit the pressure plate 50 to be raised a predetermined distance without lifting the side cutting knives 20, and during this interval the end cutting knife 21; which is, rigidly-fixed to the pressure plate 50, is lifted out of cutting'position; Continued upward-movementof the pressure plate 50 raises the side cutting. knives 201out of cutting position through the. medium of the lifting yokes Ell-,and

:finally, during further continued upward move- .40 are lifted. outof conta operated upon. Itwill beinoted th ment of the pressure plate 50, the pressure blocks ct with the panel at the intermediate filler blocks I3 extend short of the upper ends ,of the front and rear-guide blocks II and Ilso'as to provide a space therebetween into which the cam lugs :51 associated with the pressure plate 50 may ltelescopeduring downward movement of the pressure plate: wThe inside faces 'of the front operation *andthe elimination" 0 "strains on the-operating parts.

andrearguide blocks II and serve to guide the downward movementof the pressure plate :during the cutting operation, insuring smooth f distortive The pressure plate 50 'may be given the desired reciprocating -movement by i any desired me- :"chanical means, such-as "the mechanical press B illustrated in Figs. 1 and2. The mechanical *pressillustrated comprises a pair of spaced uprightstandards I 03 which rest upon the table frame I 0 I, the standards being connected at their .-upperends 'by a'yokeframe I04. A slide frame I 05 isarranged to reciprocate between the standards I03. The slide frame I05 has a securing plate I07 affi'xed'thereto to whichthe' pressure plate 5010f the machine may be'secured" as by clamps3l08; The-securingplate IIl'I of the press seats flat against the'upper surface of the pressure'plate 50 of'the 'notching machine and when these parts -;are'-clamp'ed together-'by-clamps I08 the pressure plate-50 and its-associated mechanismis positively reciprocated with the reciprocating movement of the'slide'fram'e I05} 5 The slide frame I05 may be reciprocat'ed by any i desired mechanism. As shown in Figs. 1 and 2 for purposes of illustration, power means" for reciprocating 'the'slide' frame I05 'may comprise a crankshaft IIIl journaled in bearings III asso- -ciated with the supporting standards I03. One

end of the crankshaft I I0 may be provided with'a balancing fly wheel pulley I I 3 around which a drive belt may be trained, and the other-end provided with'a friction brake II 4. A pair ofpitmans I I5 are attached-through suitable bearings to the crankshaft H0 and to s1 of hinge pins '6. v The'panel to be o'peratedupon may be supide frame I05 by means i ported upon a-table extension C suitably'fi'xed to the. table frame IUI. The panel guide bars I! may be of such lengthas to extend over the supporting frame IIII of the table '0 to positively insure accurate location of the panel with respect to the notching mechanism. g

It is important that the reciprocating movement of the pressure plate 50 be under the immediate control'of the operator. A clutch 'I2Il operatively connects the continuously rotating drive wheel -I I3 t'o'the crankshaft Ill). The clutch I20 is engaged-'by acontrol bolt [2| supported{by a bracket I22 attached to the adjacentsupporting frame 103' ofthepress'. 'Theend of the control sis-anti bolt I2I is normally held in engagement withthe clutch I by means ofacompression spring I23. When the control bolt. I2 I: is in engagement with the clutch- $21!, the crankshaft I-III does not rotate, and-when the control bolt I'M is withdrawn from engagement with the clutch I20 the crankshaft I I'II will: make one complete revolution andreeiprocate the'slideframe I105 one complete stroke. The friction brake I- I4 is adjusted to prevent rotation of the crankshaft H0 when disengaged by. the clutch iZIl from the drive wheel H3. The lower end of the control: bolt I-2I is connected to a control rod I which is manipm lated by the operator by any suitable mechanism such as a foot pedal- (notshown) To-notch: the panel as in the manner shown in Fig. 4, the operator places the panel p upon the table C and pushes the corner of the panel to be notched into the space I 9 and I9 underneath the front and rear guide: blocks II and I2. The guide bars II- are so'fixed. and adjusted as to retain the panel in the proper notching position. At this point the cutting ends 2i of. the side cutting knives 20 and: the cutting end 21" of the end cutting knife are in full raised position. In this position the pressure blocks 40 are also held in raised position so that the lower ends 41 thereof do not interfere with the insertion of the panel. It will be appreciated that the yokes 60pmvide means for suspending the side knife head blocks se and pressure blocks 40 from the raised pressure plate 50-.

When the panel: has been placed. in proper operative position beneath the notching knives 2d and 21, the operator manipulates the control rod I25, thereby withdrawing the control bolt I-2I from engagement with the clutch I20. The drive wheel I I3 will then rotate the crankshaft I In one complete revolution. It will be noted that the friction brake II4 serves to immediately halt ro tation of the crankshaft I I0- when it has made one complete revolution. 7

During the initial 180? rotation of the crankshaft I !0 the pitman s II 5- attached thereto move the slide frame I95 of the press downward-1y, likewise moving the pressure plate downwardly. The cutting end TI" of the endcutting knife 2-1 contacts the panel and starts cutting the end face 0 of the notch a. When the cam faces 58 of the cam lugs 5'! associated with the pressure plate 50 reach the bearing blocks 34- of the knife head blocks 30, the head blocks are driven downwardly in their guide slots lfi therebydriving the cutting ends 2I- of the side cutting knives 20 into the panel 1; so as to cut through the panel and sharply form. the beveled side faces-b of the notch. With this movement the contact faces 41 of the pressure blocks 40 are pressedfirmly against the panel operated upon by the action-of the coil springs 45,- which are compressedbetween the upper ends 46 of' the pressure blocks 40 and the lower ends 33 of the head blocks 30.-

As the crankshaft IIIl continues to rotate through its second 180" phase, the slide frame I05 raises the pressure platev 5'0 and Withdraws the cutting end 21 of the end. cutting knife 21- from the panel p. As the slideframe Hi5 andpressure plate 50 continue to rise, the cam lugs '51 are lifted out of contact with the knife head: blocks 30 permitting the coil springs 45 to expand and raise the head blocks 40, causing lifting withdrawal of the cutting ends'2I of the side cutting knives 20 from the panel. Expansion of the coil springs 45 and the lifting of the headblocks 40 also relieves the pressure exerted against thepresi0 sure-blocks 41L Astheipressure plate 50 conto theyokes 60' will pivot about pivot pins 61", ankfthe. pins 6'4 willsslide initheslots 63 in yoke arms 62 until the pins 64 abut the ends i3 oi the threaded stop pins 10; Continuedraising movementrot the: pressure plate wwill lift thesyok'es and with-them the knife head block's and. assoeiated-sidescuttmg knives 2 ii and pressure blocks Ant so-thattheiri lower ends are completely outofcontaet with the pan'eLwhich has been: notched; 1 1 By. the use of a .notching; machine construe as above described, notches may be cut in panels by a; single operator in rapid succession A reasonably energeticoperator can cut 20 or more notches per minute: The machine is substantially foolproof in operation and an operator becomes quickly skilled in the operation of the machine in a fewzhours. The side cutting knives 20 and end cutting knife 21: .may be easily rernoved' from the machine for sharpening when necessary and reinserted: without difficul-ty and in a few minutes time; Irregular shaped-notches and openings of almost: any shape: andcontour may be euton: this machine by providing cutting knives of the proper shape: mounted in guide blocks in proper angular position; The operating movement or thecuttin'g knives is so synchronized as: not todamage or split the panels or interfere with their proper functioningwhileacertaln novel features of the: invention have been disclosed herein and are pointed: out in: the annexed: claims it will b'e understood that various omissions,,substitutions and: changes may be made by those skilled in the artwithout departing from the spirit ofzthis' invention.

What is claimed is: V l-.- A machine for notch-mg; panels: including in combination, a support for the panel, a pair of reciprocable sidecutting: elements presenting cutting edges-for severingathe side faces of: the'notch', a reciprocable end cutting elementhaving a: cutting edge shapedto; cut the closed end: of the notch, means for guiding the reciprocating movement of said cutting elements, and means for reciprocating said cutting elements-.-

2-. A machine for notch-mg: panels including in combination; asupport'for the panel=,. a pair of reciproca-ble side cutting elements presenting cutting edges for severing the side faces ofthe notch, a reciprocable end cutting element having a cutting edgeshaped to cut the closed end of the notch, means for guiding: the reciprocating move mentpf: said cutting elements, reciprocablemeans adjacent said cutting elements for pressing. the panel againstsaid support, and means for re ciprocating. said cutting: elements and pressing means. a

3. A machine for cutting \fi-shaped notches in panels including; in: combination, a support for the panel, and a pair of angularly arranged and reciprocably mounted cutting; knives presenting cutting; edges: for severing the side faces of the notch, reciprocably' mounted pressure blocks adj acent said cutting? knives: for pressing the; panel against said supports and means for reciprocating said cuttingelements and; pressureblocks.

. 4. A machine for cutting a v' shaped notch in a work piece includingin combination, a support for thework piece, a pair" of sidecutting ele'-- ments: presenting angularly arranged: cutting edges for severing? thaside faces of the: notch, means for reciprocating: said cutting; elements; guide means for "guiding the reciprocating move: ment ofsaid: cutting elements at an inclIned -amglewhereby the .formed notch. presents beveledside ='faces, .and. means foriexerting .pressure agamst said cuttingelem'ents and pressure means into and out of operating engagementwith the work niece. Q6. A machine for cutting a V-shaped notch in the edge of a work'pieceincluding in combination; a support for the work piece, adjustable means for retaining the workpiece in proper operative position, aipair of:reciprocable side cut ting elements presenting cutting edges for severingthe side faces of the notch, guide means for guiding the reciprocatingmovement of said outthe work piece, and means connecting said mam-l ting elements at an'inclined angle whereby the 7 formed notch presents beveledside faces, means for f exerting pressure against the work piece adjacent the side faces of the notch during thecutting operation, and means" for reciprocating said cutting elements and pressure means into' and out of operating engagement with'th'e work piece; '7. A machine forcutting a notch in awork piece includingin combination, a support for the work piece, reciprocable cutting knives presenting cutting edges. for severing 'the side faces of the notch, guide blocks having inclined guide grooves for guiding'the reciprocating movement ofsaid knives, resiliently mounted pressure blocks adapted to be pressed against the face of the work piece adjacent the notch to be cut therein, and means for reciprocating said cutting'knives and pressure blocksinto and out of operating engagement with the work piece.

. 8. A machine for cutting notches in work pieces including in combination, a support for the work piece, a pair of reciprocable and angularly arranged side" cutting knives presenting cutting edges for severing the side faces of the notch,

guide blocks having inclined grooves for guiding the movement of'saidknives, head blocks fixed to said knives mounted for sliding movement in said head blocks, pressure blocks mounted for sliding movement in said guide blocks adapted to be pressed against the face of the'work-piece adjacent the notch to be cut-therein, and a reciprocable pressure block adapted to exert cutting pressure against said head blocks. 3 9. A machine for making abeveled cut in a work piece including in combination, a cutting knife presentinga cutting edge, a support under said cutting edge upon which the work piece is positioned, a guide block having inclined guide grooves for guiding the reciprocable movement of said knife along a path which is inclined with respect to. the work piece supporting face of said support, a head'block fixed to said knife mounted fo'rsliding movement in 'said guide block, a pressure block mounted for sliding movement in said guide block adapted to be pressed against the face ofthework piece adjace'ntthe path of movement of the cutting edge'of said knife, resilient means connecting saidpressure block to the head block, and;mean's for reciprocating sa'idheadblock and its associated cutting knife and pressure block.

12 -..;10.Z.A.machinefor cutting V,-fshaped notches in work; pieces including in combinatiomja support forlthework piece, apair of reciprocably mounted andv angularly. arranged side cuttingknives ,pre senting cutting-edges for severing; the-side faces of the notch, a guide block for each of said knives presenting'inclined guide grooves for guiding the reciprocating movement of its associated knife, a head block fixed to each of said knives mounted forzsliding movement in the guide block, a pressureblock mounted for slidingmovement in; each of said guide-blocks adapted to be pressedagainst the face of the workpiece adjacent thenotch to be cut therein, resilient meansv connecting each pressure block to the adjacent head block, a reciprocable. member having cam faces associated therewith adapted toengag'e said head blocks and drive the cutting edges of the cutting knives into berto said headblocks whereby the cutting knives and=pressureblocks associated with said head blocks may be'manipulated by the movementof said reciprocable member. l v

"11. A machine for making a beveled cut in a workpiece including'in combination, a support for'the work piece, a side cutting knife'presenting a cutting edge at one end'thereof positioned over the work supporting face of the support, a guide block for said knife having inclined guide grooves for slidably retaining said knife in predetermined downwardly inclined relationship with respect to the supporting face of the workpiece, a resiliently mounted pressure block operative to press" the work piece material adjacent the cut firmly against said support, a a drive member, means 'for'reciprocatingsaid drive member, a camelement associated with said drive member having a cam face substantially normal to the direction of "reciprocating movement 'of said cutting] knife for exerting cutting pressure on said cutting knife, and linkage means connecting said drive member to said cutting knife whereby said cutting knife may be lifted out of cutting engag'ementwith the work piece whenlifting movement' is exerted on said drive member.

' '1 2 A machine for cutting a V-shaped notch in a work piec'e'inc'ludin'g in combination, asupport for the work piece,apair of reciprocable side cuttingikniveseachpresenting acutting edge at one' en'd thereof for severing the side faces of the notch,-a g uide block for each of said'knives having inclined'jguide grooves :for slidably retaining said knives in a predetermined angular and inclined relationship, a reciprocable end cutting knifehaving aj cutting edge at one end thereof forseveringthe closed endof the notch, means forguiding' the reciprocating movement of said 7 end cutting knife, resiliently mounted pressure blocks operative to press the work piece material adjacent the notch firmly against said Support, a reciprocably mounted drive member, means for connecting 'saidend cutting knife to said drive member, and cam elements associated with said drive; member having cam faces substantially normal to the direction of reciprocating movement of said side cuttingknives for exerting cut- 7 ting pressure on said side cutting knives in the direction of the path of movement of'said side cutting knives, l3. 'A-machine for" cutting a Vj-shaped notch in 'a'work piec including in combination, a support -forfthe work piece, a pair of reciprocable' side cutting'knives' each presenting ,a lcutting edge at one'"end' thereof for severing the side faces of the nttcnaguide mock for'eacho'f said'knives having inclined guide grooves for slidably retaining said knives in a predetermined angular and inclined relationship, a reciprocable end cutting knife having a cutting edge at one end thereof for severing the closed end of the notch, means for guiding the reciprocal movement of said end cutting knife, resiliently mounted pressure blocks operative to press the work piece material adjacent the notch firmly against said support, a drive member, means for reciprocating said drive member, means for connecting said end cutting knife to said drive member, cam elements associated with said drive member operating to exert downward cutting pressure on said side cutting knives in the direction of the path of movement of said side cutting knives, and adjustable linkage means connecting said drive member to said side cutting knives whereby said side cutting knives may be lifted out of cutting engagement with the work piece when lifting movement is exerted on said drive member.

14. A machine for cutting V-shaped notches in wood, plywood, fibrous and like work pieces including in combination, pair of relatively flat side cutting knives, guide blocks for reciprocably supporting said knives in generally V-shaped relationship to one another, a bed plate under the cutting ends of said knives for supporting the work piece, pressure blocks reciprocably supported by said guide blocks adjacent said side cutting knives, said pressure blocks having pressure faces adapted to be pressed against the work piece closely adjacent the path of the movement of the cutting ends of said side cutting knives, and

means for reciprocating said pressure blocks and side cutting knives in synchronism.

15. A machine for cutting V-shaped notches presenting inclined side faces in wood, plywood, fibrous and the like work pieces including in combination, pair of relatively flat side cutting knives, guide blocks for reciprocabl supporting said knives in downwardly inclined and in generally V-shaped relationship to one another, a bed plate under the cutting ends of said knives for supporting the work piece, pressure blocks reciprocably supported by said guide blocks adjacent said side cutting knives, said pressure blocks having fiat pressure faces adapted to be pressed against the work piece closely adjacent the path of the movement of the cutting ends of said side cutting knives, and means for reciprocating said pressure blocks and side cutting knives in synchronism.

16. A machine for cutting V-shaped notches presenting inclined side faces in wood, plywood, fibrous and the like work pieces including in combination, pair of relatively fiat side cutting knives for cutting the inclined side faces of the notch, guide blocks for reciprocably supporting said side cutting knives in downwardly inclined and in generally V-shaped relationship to one another, an end cutting knife for cutting the closed end of said notch, a bed plate under the cutting ends of said knives for supporting the work piece, pressure blocks reciprocably supported by said guide blocks adjacent said side cutting knives, said pressure blocks having pressure faces adapted to be pressed against the work piece closely adjacent the path of the movement of the cutting ends of said side cutting knives, and means for reciproeating said pressure blocks, end cutting knife and side cutting knives in synchronism.

17. The method of cutting V-shaped notches presenting inclined faces in wood, plywood, libreboard and like work pieces which includes, placing the work piece on a support, pressing the work piece material adjacent the notch to be cut firmly against the support, and during continuance of said pressure, driving the cutting ends of the side cutting elements in an inclined direction into and through the work piece to define the inclined side faces of the notch, and substantially simultaneously driving the cutting end of the end cutting element into and through the work piece to define the closed end of the notch, then retracting the cutting end of the end cutting element from the Work piece, then retracting the cutting ends of the side cutting elements from the work piece, and finally releasing the pressure on the work piece and removing same from the support.

GLENN I-I. NORQUIST.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 26,441 Mason Dec. 13, 1859 348,763 Millet Sept. 7, 1886 530,780 Kingsbury Dec. 11, 1894 1,517,625 Glasser Dec. 2, 1924 2,208,966 Eickman July 23, 1940 2,325,230 Crane July 27, 194:3 

